Method of transmitting or receiving sidelink signal in wireless communication system

ABSTRACT

An aspect of the present disclosure provides a method of a user device in a wireless communication system, the method comprising: receiving, on one bandwidth part (BWP) among multiple BWPs, multiple discovery signals; on the basis of a delay spread value of each of the multiple discovery signals, transmitting, on the one BWP, allocation information of BWPs remaining after excluding the one BWP among the multiple BWPs; and receiving, on the remaining BWPs, multiple sidelink control signals and data signals, wherein it is configured that only an extended CP is to be used on the one BWP, and only a normal CP is to be used on the remaining BWPs. The user device is an autonomous driving vehicle or is included in an autonomous driving vehicle.

TECHNICAL FIELD

The present disclosure relates to a wireless communication system.

BACKGROUND ART

Wireless access systems have been widely deployed to provide varioustypes of communication services such as voice or data. In general, awireless access system is a multiple access system that supportscommunication of multiple users by sharing available system resources (abandwidth, transmission power, etc.) among them. For example, multipleaccess systems include a code division multiple access (CDMA) system, afrequency division multiple access (FDMA) system, a time divisionmultiple access (TDMA) system, an orthogonal frequency division multipleaccess (OFDMA) system, a single carrier frequency division multipleaccess (SC-FDMA) system and multi carrier frequency division multipleaccess (MC-FDMA) system, etc.

A wireless communication system uses various radio access technologies(RATs) such as long term evolution (LTE), LTE-advanced (LTE-A), andwireless fidelity (WiFi). 5th generation (5G) is such a wirelesscommunication system. Three key requirement areas of 5G include (1)enhanced mobile broadband (eMBB), (2) massive machine type communication(mMTC), and (3) ultra-reliable and low latency communications (URLLC).Some use cases may require multiple dimensions for optimization, whileothers may focus only on one key performance indicator (KPI). 5Gsupports such diverse use cases in a flexible and reliable way.

eMBB goes far beyond basic mobile Internet access and covers richinteractive work, media and entertainment applications in the cloud oraugmented reality (AR). Data is one of the key drivers for 5G and in the5G era, we may for the first time see no dedicated voice service. In 5G,voice is expected to be handled as an application program, simply usingdata connectivity provided by a communication system. The main driversfor an increased traffic volume are the increase in the size of contentand the number of applications requiring high data rates. Streamingservices (audio and video), interactive video, and mobile Internetconnectivity will continue to be used more broadly as more devicesconnect to the Internet. Many of these applications require always-onconnectivity to push real time information and notifications to users.Cloud storage and applications are rapidly increasing for mobilecommunication platforms. This is applicable for both work andentertainment. Cloud storage is one particular use case driving thegrowth of uplink data rates. 5G will also be used for remote work in thecloud which, when done with tactile interfaces, requires much lowerend-to-end latencies in order to maintain a good user experience.Entertainment, for example, cloud gaming and video streaming, is anotherkey driver for the increasing need for mobile broadband capacity.Entertainment will be very essential on smart phones and tabletseverywhere, including high mobility environments such as trains, carsand airplanes. Another use case is augmented reality (AR) forentertainment and information search, which requires very low latenciesand significant instant data volumes.

One of the most expected 5G use cases is the functionality of activelyconnecting embedded sensors in every field, that is, mMTC. It isexpected that there will be 20.4 billion potential Internet of things(IoT) devices by 2020. In industrial IoT, 5G is one of areas that playkey roles in enabling smart city, asset tracking, smart utility,agriculture, and security infrastructure.

URLLC includes services which will transform industries withultra-reliable/available, low latency links such as remote control ofcritical infrastructure and self-driving vehicles. The level ofreliability and latency are vital to smart-grid control, industrialautomation, robotics, drone control and coordination, and so on.

Now, multiple use cases will be described in detail.

5G may complement fiber-to-the home (FTTH) and cable-based broadband (ordata-over-cable service interface specifications (DOCSIS)) as a means ofproviding streams at data rates of hundreds of megabits per second togiga bits per second. Such a high speed is required for TV broadcasts ator above a resolution of 4K (6K, 8K, and higher) as well as virtualreality (VR) and AR. VR and AR applications mostly include immersivesport games. A special network configuration may be required for aspecific application program. For VR games, for example, game companiesmay have to integrate a core server with an edge network server of anetwork operator in order to minimize latency.

The automotive sector is expected to be a very important new driver for5G, with many use cases for mobile communications for vehicles. Forexample, entertainment for passengers requires simultaneous highcapacity and high mobility mobile broadband, because future users willexpect to continue their good quality connection independent of theirlocation and speed. Other use cases for the automotive sector are ARdashboards. These display overlay information on top of what a driver isseeing through the front window, identifying objects in the dark andtelling the driver about the distances and movements of the objects. Inthe future, wireless modules will enable communication between vehiclesthemselves, information exchange between vehicles and supportinginfrastructure and between vehicles and other connected devices (e.g.,those carried by pedestrians). Safety systems may guide drivers onalternative courses of action to allow them to drive more safely andlower the risks of accidents. The next stage will be remote-controlledor self-driving vehicles. These require very reliable, very fastcommunication between different self-driving vehicles and betweenvehicles and infrastructure. In the future, self-driving vehicles willexecute all driving activities, while drivers are focusing on trafficabnormality elusive to the vehicles themselves. The technicalrequirements for self-driving vehicles call for ultra-low latencies andultra-high reliability, increasing traffic safety to levels humanscannot achieve.

Smart cities and smart homes, often referred to as smart society, willbe embedded with dense wireless sensor networks. Distributed networks ofintelligent sensors will identify conditions for cost- andenergy-efficient maintenance of the city or home. A similar setup can bedone for each home, where temperature sensors, window and heatingcontrollers, burglar alarms, and home appliances are all connectedwirelessly. Many of these sensors are typically characterized by lowdata rate, low power, and low cost, but for example, real time highdefinition (HD) video may be required in some types of devices forsurveillance.

The consumption and distribution of energy, including heat or gas, isbecoming highly decentralized, creating the need for automated controlof a very distributed sensor network. A smart grid interconnects suchsensors, using digital information and communications technology togather and act on information. This information may include informationabout the behaviors of suppliers and consumers, allowing the smart gridto improve the efficiency, reliability, economics and sustainability ofthe production and distribution of fuels such as electricity in anautomated fashion. A smart grid may be seen as another sensor networkwith low delays.

The health sector has many applications that may benefit from mobilecommunications. Communications systems enable telemedicine, whichprovides clinical health care at a distance. It helps eliminate distancebarriers and may improve access to medical services that would often notbe consistently available in distant rural communities. It is also usedto save lives in critical care and emergency situations. Wireless sensornetworks based on mobile communication may provide remote monitoring andsensors for parameters such as heart rate and blood pressure.

Wireless and mobile communications are becoming increasingly importantfor industrial applications. Wires are expensive to install andmaintain, and the possibility of replacing cables with reconfigurablewireless links is a tempting opportunity for many industries. However,achieving this requires that the wireless connection works with asimilar delay, reliability and capacity as cables and that itsmanagement is simplified. Low delays and very low error probabilitiesare new requirements that need to be addressed with 5G

Finally, logistics and freight tracking are important use cases formobile communications that enable the tracking of inventory and packageswherever they are by using location-based information systems. Thelogistics and freight tracking use cases typically require lower datarates but need wide coverage and reliable location information.

A wireless communication system is a multiple access system thatsupports communication of multiple users by sharing available systemresources (a bandwidth, transmission power, etc.). Examples of multipleaccess systems include a CDMA system, an FDMA system, a TDMA system, anOFDMA system, an SC-FDMA system, and an MC-FDMA system.

Sidelink (SL) refers to a communication scheme in which a direct link isestablished between user equipments (UEs) and the UEs directly exchangevoice or data without intervention of a base station (BS). SL isconsidered as a solution of relieving the BS of the constraint ofrapidly growing data traffic.

Vehicle-to-everything (V2X) is a communication technology in which avehicle exchanges information with another vehicle, a pedestrian, andinfrastructure by wired/wireless communication. V2X may be categorizedinto four types: vehicle-to-vehicle (V2V), vehicle-to-infrastructure(V2I), vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). V2Xcommunication may be provided via a PC5 interface and/or a Uu interface.

As more and more communication devices demand larger communicationcapacities, there is a need for enhanced mobile broadband communicationrelative to existing RATs. Accordingly, a communication system is underdiscussion, for which services or UEs sensitive to reliability andlatency are considered. The next-generation RAT in which eMBB, MTC, andURLLC are considered is referred to as new RAT or NR. In NR, V2Xcommunication may also be supported.

FIG. 1 is a diagram illustrating V2X communication based on pre-NR RATand V2X communication based on NR in comparison.

For V2X communication, a technique of providing safety service based onV2X messages such as basic safety message (BSM), cooperative awarenessmessage (CAM), and decentralized environmental notification message(DENM) was mainly discussed in the pre-NR RAT. The V2X message mayinclude location information, dynamic information, and attributeinformation. For example, a UE may transmit a CAM of a periodic messagetype and/or a DENM of an event-triggered type to another UE.

For example, the CAM may include basic vehicle information includingdynamic state information such as a direction and a speed, vehiclestatic data such as dimensions, an external lighting state, pathdetails, and so on. For example, the UE may broadcast the CAM which mayhave a latency less than 100 ms. For example, when an unexpectedincident occurs, such as breakage or an accident of a vehicle, the UEmay generate the DENM and transmit the DENM to another UE. For example,all vehicles within the transmission range of the UE may receive the CAMand/or the DENM. In this case, the DENM may have priority over the CAM.

In relation to V2X communication, various V2X scenarios are presented inNR. For example, the V2X scenarios include vehicle platooning, advanceddriving, extended sensors, and remote driving.

For example, vehicles may be dynamically grouped and travel togetherbased on vehicle platooning. For example, to perform platoon operationsbased on vehicle platooning, the vehicles of the group may receiveperiodic data from a leading vehicle. For example, the vehicles of thegroup may widen or narrow their gaps based on the periodic data.

For example, a vehicle may be semi-automated or full-automated based onadvanced driving. For example, each vehicle may adjust a trajectory ormaneuvering based on data obtained from a nearby vehicle and/or a nearbylogical entity. For example, each vehicle may also share a dividingintention with nearby vehicles.

Based on extended sensors, for example, raw or processed data obtainedthrough local sensor or live video data may be exchanged betweenvehicles, logical entities, terminals of pedestrians and/or V2Xapplication servers. Accordingly, a vehicle may perceive an advancedenvironment relative to an environment perceivable by its sensor.

Based on remote driving, for example, a remote driver or a V2Xapplication may operate or control a remote vehicle on behalf of aperson incapable of driving or in a dangerous environment. For example,when a path may be predicted as in public transportation, cloudcomputing-based driving may be used in operating or controlling theremote vehicle. For example, access to a cloud-based back-end serviceplatform may also be used for remote driving.

A scheme of specifying service requirements for various V2X scenariosincluding vehicle platooning, advanced driving, extended sensors, andremote driving is under discussion in NR-based V2X communication.

DISCLOSURE Technical Problem

Various embodiments of the present disclosure may provide a method oftransmitting and receiving a signal and an apparatus supporting the samein a wireless communication system.

Specifically, various embodiments of the present disclosure may providea method of allocating a plurality of bandwidth parts (BWPs) to a linkbetween a plurality of user equipments (UEs) to solve the problem ofmutual interference and inter-carrier interference (ICI)/inter-symbolinterference (ISI)-caused performance degradation, and an apparatussupporting the same in a wireless communication system.

It will be appreciated by persons skilled in the art that the objectsthat could be achieved with the present disclosure are not limited towhat has been particularly described hereinabove and the above and otherobjects that the present disclosure could achieve will be more clearlyunderstood from the following detailed description.

Technical Solution

Various embodiments of the present disclosure may provide a method oftransmitting and receiving a signal and an apparatus supporting the samein a wireless communication system.

According to an aspect of the present disclosure, a method of a userequipment (UE) in a wireless communication system includes receiving aplurality of discovery signals in one of a plurality of bandwidth parts(BWPs), transmitting allocation information about remaining BWPs exceptfor the one BWP among the plurality of BWPs in the one BWP, based ondelay spread values of the plurality of respective discovery signals,and receiving a plurality of sidelink control signals and data signalsin the remaining BWPs. The one BWP is configured to be used only with anextended cyclic prefix (CP), and the remaining BWPs are configured to beused only with a normal CP.

Based on the delay spread values being included in a length of thenormal CP, the remaining BWPs may be allocated differently to aplurality of respective UEs which have transmitted the plurality ofdiscovery signals.

Based on the delay spread values being equal to or larger than (n−1)times the length of the normal CP and less than n times the length ofthe normal CP, the remaining BWPs may be allocated differently to theplurality of respective UEs which have transmitted the plurality ofdiscovery signals, and n may be a natural number.

The one BWP and the remaining BWPs may be allocated to differentresources in a time domain.

A time gap may be configured between the one BWP and each of theremaining BWPs.

The allocation information may include an index of a BWP allocated toeach of a plurality of UEs which have transmitted the plurality ofdiscovery signals.

According to another aspect of the present disclosure, an apparatus fora UE in a wireless communication system includes at least one processor,and at least one memory operably coupled to the at least one processorand storing at least one instruction which causes the at least oneprocessor to perform operations. The operations include receiving aplurality of discovery signals in one of a plurality of BWPs,transmitting allocation information about remaining BWPs except for theone BWP among the plurality of BWPs in the one BWP, based on delayspread values of the plurality of respective discovery signals, andreceiving a plurality of sidelink control signals and data signals inthe remaining BWPs. The one BWP is configured to be used only with anextended CP, and the remaining BWPs are configured to be used only witha normal CP.

Based on the delay spread values being included in a length of thenormal CP, the remaining BWPs may be allocated differently to aplurality of respective UEs which have transmitted the plurality ofdiscovery signals.

Based on the delay spread values being equal to or larger than (n−1)times the length of the normal CP and less than n times the length ofthe normal CP, the remaining BWPs may be allocated differently to theplurality of respective UEs which have transmitted the plurality ofdiscovery signals, and n may be a natural number.

The one BWP and the remaining BWPs may be allocated to differentresources in a time domain.

The allocation information may include an index of a BWP allocated toeach of a plurality of UEs which have transmitted the plurality ofdiscovery signals.

The UE may be an autonomous driving vehicle or may be included in anautonomous driving vehicle.

According to another aspect of the present disclosure, a processor forperforming operations for a UE in a wireless communication system isprovided. The operations include receiving a plurality of discoverysignals in one of a plurality of BWPs, transmitting allocationinformation about remaining BWPs except for the one BWP among theplurality of BWPs in the one BWP, based on delay spread values of theplurality of respective discovery signals, and receiving a plurality ofsidelink control signals and data signals in the remaining BWPs. The oneBWP is configured to be used only with an extended CP, and the remainingBWPs are configured to be used only with a normal CP.

According to another aspect of the present disclosure, acomputer-readable storage medium storing at least one computer programincluding at least one instruction which, when executed by at least oneprocessor, causes the at least one processor to perform operations for aUE is provided. The operations include receiving a plurality ofdiscovery signals in one of a plurality of BWPs, transmitting allocationinformation about remaining BWPs except for the one BWP among theplurality of BWPs in the one BWP, based on delay spread values of theplurality of respective discovery signals, and receiving a plurality ofsidelink control signals and data signals in the remaining BWPs. The oneBWP is configured to be used only with an extended CP, and the remainingBWPs are configured to be used only with a normal CP.

The above-described aspects of the present disclosure are merely some ofthe preferred embodiments of the present disclosure, and variousembodiments reflecting the technical features of the present disclosuremay be derived and understood by those skilled in the art based on thefollowing detailed description of the disclosure.

Advantageous Effects

The embodiments of the present disclosure have the following effects.

According to various embodiments of the present disclosure, a method ofallocating a plurality of bandwidth parts (BWPs) to a link between aplurality of user equipments (UEs) to solve the problem of mutualinterference and inter-carrier interference (ICI)/inter-symbolinterference (ISI)-caused performance degradation, and an apparatussupporting the same in a wireless communication system may be provided.

It will be appreciated by persons skilled in the art that that theeffects that can be achieved through the present invention are notlimited to what has been particularly described hereinabove and otheradvantages of the present invention will be more clearly understood fromthe following detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the disclosure, provide embodiments of the presentdisclosure together with detail explanation. Yet, a technicalcharacteristic of the present disclosure is not limited to a specificdrawing. Characteristics disclosed in each of the drawings are combinedwith each other to configure a new embodiment. Reference numerals ineach drawing correspond to structural elements.

FIG. 1 is a diagram illustrating vehicle-to-everything (V2X)communication based on pre-new radio access technology (NR) RAT and V2Xcommunication based on NR in comparison.

FIG. 2 is a diagram illustrating the structure of a long term evolution(LTE) system according to an embodiment of the present disclosure.

FIG. 3 is a diagram illustrating user-plane and control-plane radioprotocol architectures according to an embodiment of the presentdisclosure.

FIG. 4 is a diagram illustrating the structure of an NR system accordingto an embodiment of the present disclosure.

FIG. 5 is a diagram illustrating functional split between a nextgeneration radio access network (NG-RAN) and a 5th generation corenetwork (5GC) according to an embodiment of the present disclosure.

FIG. 6 is a diagram illustrating the structure of an NR radio frame towhich embodiment(s) of the present disclosure is applicable.

FIG. 7 is a diagram illustrating a slot structure in an NR frameaccording to an embodiment of the present disclosure.

FIG. 8 is a diagram illustrating radio protocol architectures forsidelink (SL) communication according to an embodiment of the presentdisclosure.

FIG. 9 is a diagram illustrating radio protocol architectures for SLcommunication according to an embodiment of the present disclosure;

FIG. 10 is a diagram illustrating the structure of a secondarysynchronization signal block (S-SSB) in a normal cyclic prefix (NCP)case according to an embodiment of the present disclosure.

FIG. 11 is a diagram illustrating the structure of an S-SSB in anextended cyclic prefix (ECP) case according to an embodiment of thepresent disclosure.

FIG. 12 is a diagram illustrating user equipments (UEs) which conductV2X or SL communication between them according to an embodiment of thepresent disclosure.

FIG. 13 is diagram illustrating resource units for V2X or SLcommunication according to an embodiment of the present disclosure.

FIG. 14 is a diagram illustrating signal flows for V2X or SLcommunication procedures of a UE according to transmission modesaccording to an embodiment of the present disclosure.

FIG. 15 is a diagram illustrating a plurality of bandwidth parts (BWPs)according to an embodiment of the present disclosure.

FIG. 16 is a diagram illustrating a BWP according to an embodiment ofthe present disclosure.

FIG. 17 is a diagram illustrating the types of links between UEs in aBWP.

FIG. 18 is a diagram illustrating orthogonal frequency divisionmultiplexing (OFDM) symbols transmitted on each of a plurality of links.

FIG. 19 is a diagram illustrating a discovery signal transmitted on eachof a plurality of links.

FIGS. 20 and 21 are diagrams illustrating a BWP allocation methodaccording to an embodiment of the present disclosure.

FIG. 22 is a diagram illustrating a BWP allocation method according toanother embodiment of the present disclosure.

FIG. 23 is a diagram illustrating a BWP allocation method according toanother embodiment of the present disclosure.

FIG. 24 is a diagram illustrating a time gap configuration methodaccording to an embodiment of the present disclosure.

FIG. 25 is a flowchart illustrating a BWP allocation method according toan embodiment of the present disclosure.

FIG. 26 is a flowchart illustrating an SL signal transmission methodaccording to an embodiment of the present disclosure.

FIGS. 27 to 33 are block diagrams illustrating various devicesapplicable to embodiment(s) of the present disclosure.

BEST MODE

In various embodiments of the present disclosure, “/” and “,” should beinterpreted as “and/or”. For example, “A/B” may mean “A and/or B”.Further, “A, B” may mean “A and/or B”. Further, “A/B/C” may mean “atleast one of A, B and/or C”. Further, “A, B, C” may mean “at least oneof A, B and/or C”.

In various embodiments of the present disclosure, “or” should beinterpreted as “and/or”. For example, “A or B” may include “only A”,“only B”, and/or “both A and B”. In other words, “or” should beinterpreted as “additionally or alternatively”.

Techniques described herein may be used in various wireless accesssystems such as code division multiple access (CDMA), frequency divisionmultiple access (FDMA), time division multiple access (TDMA), orthogonalfrequency division multiple access (OFDMA), single carrier-frequencydivision multiple access (SC-FDMA), and so on. CDMA may be implementedas a radio technology such as universal terrestrial radio access (UTRA)or CDMA2000. TDMA may be implemented as a radio technology such asglobal system for mobile communications (GSM)/general packet radioservice (GPRS)/Enhanced Data Rates for GSM Evolution (EDGE). OFDMA maybe implemented as a radio technology such as IEEE 802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE 802.20, evolved-UTRA (E-UTRA), or the like. IEEE802.16m is an evolution of IEEE 802.16e, offering backward compatibilitywith an IRRR 802.16e-based system. UTRA is a part of universal mobiletelecommunications system (UMTS). 3rd generation partnership project(3GPP) long term evolution (LTE) is a part of evolved UMTS (E-UMTS)using evolved UTRA (E-UTRA). 3GPP LTE employs OFDMA for downlink (DL)and SC-FDMA for uplink (UL). LTE-advanced (LTE-A) is an evolution of3GPP LTE.

A successor to LTE-A, 5th generation (5G) new radio access technology(NR) is a new clean-state mobile communication system characterized byhigh performance, low latency, and high availability. 5G NR may use allavailable spectral resources including a low frequency band below 1 GHz,an intermediate frequency band between 1 GHz and 10 GHz, and a highfrequency (millimeter) band of 24 GHz or above.

While the following description is given mainly in the context of LTE-Aor 5G NR for the clarity of description, the technical idea of anembodiment of the present disclosure is not limited thereto.

FIG. 2 illustrates the structure of an LTE system according to anembodiment of the present disclosure. This may also be called an evolvedUMTS terrestrial radio access network (E-UTRAN) or LTE/LTE-A system.

Referring to FIG. 2, the E-UTRAN includes evolved Node Bs (eNBs) 20which provide a control plane and a user plane to UEs 10. A UE 10 may befixed or mobile, and may also be referred to as a mobile station (MS),user terminal (UT), subscriber station (SS), mobile terminal (MT), orwireless device. An eNB 20 is a fixed station communication with the UE10 and may also be referred to as a base station (BS), a basetransceiver system (BTS), or an access point.

eNBs 20 may be connected to each other via an X2 interface. An eNB 20 isconnected to an evolved packet core (EPC) 39 via an S1 interface. Morespecifically, the eNB 20 is connected to a mobility management entity(MME) via an S1-MME interface and to a serving gateway (S-GW) via anS1-U interface.

The EPC 30 includes an MME, an S-GW, and a packet data network-gateway(P-GW). The MME has access information or capability information aboutUEs, which are mainly used for mobility management of the UEs. The S-GWis a gateway having the E-UTRAN as an end point, and the P-GW is agateway having a packet data network (PDN) as an end point.

Based on the lowest three layers of the open system interconnection(OSI) reference model known in communication systems, the radio protocolstack between a UE and a network may be divided into Layer 1 (L1), Layer2 (L2) and Layer 3 (L3). These layers are defined in pairs between a UEand an Evolved UTRAN (E-UTRAN), for data transmission via the Uuinterface. The physical (PHY) layer at L1 provides an informationtransfer service on physical channels. The radio resource control (RRC)layer at L3 functions to control radio resources between the UE and thenetwork. For this purpose, the RRC layer exchanges RRC messages betweenthe UE and an eNB.

FIG. 3(a) illustrates a user-plane radio protocol architecture accordingto an embodiment of the disclosure.

FIG. 3(b) illustrates a control-plane radio protocol architectureaccording to an embodiment of the disclosure. A user plane is a protocolstack for user data transmission, and a control plane is a protocolstack for control signal transmission.

Referring to FIGS. 3(a) and 3(b), the PHY layer provides an informationtransfer service to its higher layer on physical channels. The PHY layeris connected to the medium access control (MAC) layer through transportchannels and data is transferred between the MAC layer and the PHY layeron the transport channels. The transport channels are divided accordingto features with which data is transmitted via a radio interface.

Data is transmitted on physical channels between different PHY layers,that is, the PHY layers of a transmitter and a receiver. The physicalchannels may be modulated in orthogonal frequency division multiplexing(OFDM) and use time and frequencies as radio resources.

The MAC layer provides services to a higher layer, radio link control(RLC) on logical channels. The MAC layer provides a function of mappingfrom a plurality of logical channels to a plurality of transportchannels. Further, the MAC layer provides a logical channel multiplexingfunction by mapping a plurality of logical channels to a singletransport channel. A MAC sublayer provides a data transmission serviceon the logical channels.

The RLC layer performs concatenation, segmentation, and reassembly forRLC serving data units (SDUs). In order to guarantee various quality ofservice (QoS) requirements of each radio bearer (RB), the RLC layerprovides three operation modes, transparent mode (TM), unacknowledgedmode (UM), and acknowledged Mode (AM). An AM RLC provides errorcorrection through automatic repeat request (ARQ).

The RRC layer is defined only in the control plane and controls logicalchannels, transport channels, and physical channels in relation toconfiguration, reconfiguration, and release of RBs. An RB refers to alogical path provided by L1 (the PHY layer) and L2 (the MAC layer, theRLC layer, and the packet data convergence protocol (PDCP) layer), fordata transmission between the UE and the network.

The user-plane functions of the PDCP layer include user datatransmission, header compression, and ciphering. The control-planefunctions of the PDCP layer include control-plane data transmission andciphering/integrity protection.

RB establishment amounts to a process of defining radio protocol layersand channel features and configuring specific parameters and operationmethods in order to provide a specific service. RBs may be classifiedinto two types, signaling radio bearer (SRB) and data radio bearer(DRB). The SRB is used as a path in which an RRC message is transmittedon the control plane, whereas the DRB is used as a path in which userdata is transmitted on the user plane.

Once an RRC connection is established between the RRC layer of the UEand the RRC layer of the E-UTRAN, the UE is placed in RRC_CONNECTEDstate, and otherwise, the UE is placed in RRC_IDLE state. In NR,RRC_INACTIVE state is additionally defined. A UE in the RRC_INACTIVEstate may maintain a connection to a core network, while releasing aconnection from an eNB.

DL transport channels carrying data from the network to the UE include abroadcast channel (BCH) on which system information is transmitted and aDL shared channel (DL SCH) on which user traffic or a control message istransmitted. Traffic or a control message of a DL multicast or broadcastservice may be transmitted on the DL-SCH or a DL multicast channel (DLMCH). UL transport channels carrying data from the UE to the networkinclude a random access channel (RACH) on which an initial controlmessage is transmitted and an UL shared channel (UL SCH) on which usertraffic or a control message is transmitted.

The logical channels which are above and mapped to the transportchannels include a broadcast control channel (BCCH), a paging controlchannel (PCCH), a common control channel (CCCH), a multicast controlchannel (MCCH), and a multicast traffic channel (MTCH).

A physical channel includes a plurality of OFDM symbol in the timedomain by a plurality of subcarriers in the frequency domain. Onesubframe includes a plurality of OFDM symbols in the time domain. An RBis a resource allocation unit defined by a plurality of OFDM symbols bya plurality of subcarriers. Further, each subframe may use specificsubcarriers of specific OFDM symbols (e.g., the first OFDM symbol) in acorresponding subframe for a physical DL control channel (PDCCH), thatis, an L1/L2 control channel A transmission time interval (TTI) is aunit time for subframe transmission.

FIG. 4 illustrates the structure of an NR system according to anembodiment of the present disclosure.

Referring to FIG. 4, a next generation radio access network (NG-RAN) mayinclude a next generation Node B (gNB) and/or an eNB, which providesuser-plane and control-plane protocol termination to a UE. In FIG. 4,the NG-RAN is shown as including only gNBs, by way of example. A gNB andan eNB are connected to each other via an Xn interface. The gNB and theeNB are connected to a 5G core network (5GC) via an NG interface. Morespecifically, the gNB and the eNB are connected to an access andmobility management function (AMF) via an NG-C interface and to a userplane function (UPF) via an NG-U interface.

FIG. 5 illustrates functional split between the NG-RAN and the 5GCaccording to an embodiment of the present disclosure.

Referring to FIG. 5, a gNB may provide functions including inter-cellradio resource management (RRM), radio admission control, measurementconfiguration and provision, and dynamic resource allocation. The AMFmay provide functions such as non-access stratum (NAS) security andidle-state mobility processing. The UPF may provide functions includingmobility anchoring and protocol data unit (PDU) processing. A sessionmanagement function (SMF) may provide functions including UE Internetprotocol (IP) address allocation and PDU session control.

FIG. 6 illustrates a radio frame structure in NR, to which embodiment(s)of the present disclosure is applicable.

Referring to FIG. 6, a radio frame may be used for UL transmission andDL transmission in NR. A radio frame is 10 ms in length, and may bedefined by two 5-ms half-frames. An HF may include five 1-ms subframes.A subframe may be divided into one or more slots, and the number ofslots in an SF may be determined according to a subcarrier spacing(SCS). Each slot may include 12 or 14 OFDM(A) symbols according to acyclic prefix (CP).

In a normal CP (NCP) case, each slot may include 14 symbols, whereas inan extended CP (ECP) case, each slot may include 12 symbols. Herein, asymbol may be an OFDM symbol (or CP-OFDM symbol) or an SC-FDMA symbol(or DFT-s-OFDM symbol).

Table 1 below lists the number of symbols per slot N^(slot) _(symb), thenumber of slots per frame N^(frame,u) _(slot), and the number of slotsper subframe N^(subframe,u) _(slot) according to an SCS configuration μin the NCP case.

TABLE 1 SCS (15*2u) N^(slot) _(symb) N^(frame, u) _(slot)N^(subframe, u) _(slot) 15 KHz (u = 0) 14 10 1 30 KHz (u = 1) 14 20 2 60KHz (u = 2) 14 40 4 120 KHz (u = 3) 14 80 8 240 KHz (u = 4) 14 160 16

Table 2 below lists the number of symbols per slot, the number of slotsper frame, and the number of slots per subframe according to an SCS inthe ECP case.

TABLE 2 SCS (15*2{circumflex over ( )}u) N^(slot) _(symb) N^(frame, u)_(slot) N^(subframe, u) _(slot) 60 KHz (u = 2) 12 40 4

In the NR system, different OFDM(A) numerologies (e.g., SCSs, CPlengths, and so on) may be configured for a plurality of cellsaggregated for one UE. Accordingly, the (absolute time) duration of atime resource including the same number of symbols (e.g., a subframe,slot, or TTI) (collectively referred to as a time unit (TU) forconvenience) may be configured to be different for the aggregated cells.

In NR, various numerologies or SCSs may be supported to support various5G services. For example, with an SCS of 15 kHz, a wide area intraditional cellular bands may be supported, while with an SCS of 30kHz/60 kHz, a dense urban area, a lower latency, and a wide carrierbandwidth may be supported. With an SCS of 60 kHz or higher, a bandwidthlarger than 24.25 GHz may be supported to overcome phase noise.

An NR frequency band may be defined by two types of frequency ranges,FR1 and FR2. The numerals in each frequency range may be changed. Forexample, the two types of frequency ranges may be given in [Table 3]. Inthe NR system, FR1 may be a “sub 6 GHz range” and FR2 may be an “above 6GHz range” called millimeter wave (mmW).

TABLE 3 Frequency Range Corresponding Subcarrier designation frequencyrange Spacing (SCS) FR1  450 MHz-6000 MHz 15, 30, 60 kHz FR2 24250MHz-52600 MHz 60, 120, 240 kHz

As mentioned above, the numerals in a frequency range may be changed inthe NR system. For example, FR1 may range from 410 MHz to 7125 MHz aslisted in [Table 4]. That is, FR1 may include a frequency band of 6 GHz(or 5850, 5900, and 5925 MHz) or above. For example, the frequency bandof 6 GHz (or 5850, 5900, and 5925 MHz) or above may include anunlicensed band. The unlicensed band may be used for various purposes,for example, vehicle communication (e.g., autonomous driving).

TABLE 4 Frequency Range Corresponding Subcarrier designation frequencyrange Spacing (SCS) FR1  410 MHz-7125 MHz 15, 30, 60 kHz FR2 24250MHz-52600 MHz 60, 120, 240 kHz

FIG. 7 illustrates a slot structure in an NR frame according to anembodiment of the present disclosure.

Referring to FIG. 7, a slot includes a plurality of symbols in the timedomain. For example, one slot may include 14 symbols in an NCP case and12 symbols in an ECP case. Alternatively, one slot may include 7 symbolsin an NCP case and 6 symbols in an ECP case.

A carrier includes a plurality of subcarriers in the frequency domain.An RB may be defined by a plurality of (e.g., 12) consecutivesubcarriers in the frequency domain. A bandwidth part (BWP) may bedefined by a plurality of consecutive (physical) RBs ((P)RBs) in thefrequency domain and correspond to one numerology (e.g., SCS, CP length,or the like). A carrier may include up to N (e.g., 5) BWPs. Datacommunication may be conducted in an activated BWP. Each element may bereferred to as a resource element (RE) in a resource grid, to which onecomplex symbol may be mapped.

A radio interface between UEs or a radio interface between a UE and anetwork may include L1, L2, and L3. In various embodiments of thepresent disclosure, L1 may refer to the PHY layer. For example, L2 mayrefer to at least one of the MAC layer, the RLC layer, the PDCH layer,or the SDAP layer. For example, L3 may refer to the RRC layer.

Now, a description will be given of sidelink (SL) communication.

FIG. 8 illustrates a radio protocol architecture for SL communicationaccording to an embodiment of the present disclosure. Specifically, FIG.8(a) illustrates a user-plane protocol stack in LTE, and FIG. 8(b)illustrates a control-plane protocol stack in LTE.

FIG. 9 illustrates a radio protocol architecture for SL communicationaccording to an embodiment of the present disclosure. Specifically, FIG.9(a) illustrates a user-plane protocol stack in NR, and FIG. 9(b)illustrates a control-plane protocol stack in NR.

Sidelink synchronization signals (SLSSs) and synchronization informationwill be described below.

The SLSSs, which are SL-specific sequences, may include a primarysidelink synchronization signal (PSSS) and a secondary sidelinksynchronization signal (SSSS). The PSSS may be referred to as a sidelinkprimary synchronization signal (S-PSS), and the SSSS may be referred toas a sidelink secondary synchronization signal (S-SSS). For example,length-127 M-sequences may be used for the S-PSS, and length-127gold-sequences may be used for the S-SSS. For example, the UE may detectan initial signal and acquire synchronization by using the S-PSS. Forexample, the UE may acquire fine synchronization and detect asynchronization signal ID, by using the S-PSS and the S-SSS.

A physical sidelink broadcast channel (PSBCH) may be a (broadcast)channel carrying basic (system) information that the UE needs to firstknow before transmitting and receiving an SL signal. For example, thebasic information may include information related to the SLSSs, duplexmode (DM) information, time division duplex (TDD) UL/DL (UL/DL)configuration information, resource pool-related information,information about the type of an application related to the SLSSs,subframe offset information, broadcast information, and so on. Forexample, the payload size of the PSBCH may be 56 bits, including a24-bit cyclic redundancy check (CRC), for evaluation of PSBCHperformance in NR V2X.

The S-PSS, S-SSS, and PSBCH may be included in a block format (e.g., SLsynchronization signal (SL SS)/PSBCH block, hereinafter, referred to assidelink-synchronization signal block (S-SSB)) supporting periodictransmission. The S-SSB may have the same numerology (i.e., SCS and CPlength) as a physical sidelink control channel (PSCCH)/physical sidelinkshared channel (PSSCH) in a carrier, and the transmission bandwidth ofthe S-SSB may be within a (pre)configured SL BWP. For example, thebandwidth of the S-SSB may be 11 RBs. For example, the PSBCH may span 11RBs. The frequency position of the S-SSB may be (pre)set. Therefore, theUE does not need to perform hypothesis detection in a frequency todiscover the S-SSB in the carrier.

In the NR SL system, a plurality of numerologies including differentSCSs and/or CP lengths may be supported. As an SCS increases, the lengthof a time resource for S-SSB transmission of a UE may be shortened.Accordingly, in order to ensure coverage of the S-SSB, a transmitting UEmay transmit one or more S-SSBs to a receiving terminal within one S-SSBtransmission period according to the SCS. For example, the number ofS-SSBs that the transmitting terminal transmits to the receivingterminal within one S-SSB transmission period may be pre-configured orconfigured for the transmitting UE. For example, the S-SSB transmissionperiod may be 160 ms. For example, for all SCSs, an S-SSB transmissionperiod of 160 ms may be supported.

For example, when the SCS is 15 kHz in FR1, the transmitting UE maytransmit one or two S-SSBs to the receiving UE within one S-SSBtransmission period. For example, when the SCS is 30 kHz in FR1, thetransmitting UE may transmit one or two S-SSBs to the receiving UEwithin one S-SSB transmission period. For example, when the SCS is 60kHz in FR1, the transmitting UE may transmit one, two or four S-SSBs tothe receiving UE within one S-SSB transmission period.

For example, when the SCS is 60 kHz in FR2, the transmitting UE maytransmit 1, 2, 4, 8, 16, or 32 S-SSBs to the receiving UE within oneS-SSB transmission period. For example, when the SCS is 120 kHz in FR2,the transmitting UE may transmit 1, 2, 4, 8, 16, 32, or 64 S-SSBs to thereceiving UE within one S-SSB transmission period.

When the SCS is 60 kHz, two types of CPs may be supported. Further, thestructure of an S-SSB transmitted by the transmitting UE to thereceiving UE may be different according to a CP type. For example, theCP type may be an NCP or an ECP. Specifically, for example, when the CPtype is NCP, the number of symbols to which the PSBCH is mapped in theS-SSB transmitted by the transmitting UE may be 9 or 8. On the otherhand, for example, when the CP type is ECP, the number of symbols towhich the PSBCH is mapped in the S-SSB transmitted by the transmittingUE may be 7 or 6. For example, the PSBCH may be mapped to the firstsymbol of the S-SSB transmitted by the transmitting UE. For example,upon receipt of the S-SSB, the receiving UE may perform an automaticgain control (AGC) operation in the first symbol period of the S-SSB.

FIG. 10 illustrates the structure of an S-SSB in an NCP case accordingto an embodiment of the present disclosure.

For example, when the CP type is NCP, FIG. 10 may be referred to for thestructure of the S-SSB, that is, the order of symbols to which theS-PSS, S-SSS and PSBCH are mapped in the S-SSB transmitted by thetransmitting UE.

FIG. 11 illustrates the structure of an S-SSB in an ECP case accordingto an embodiment of the present disclosure.

In the ECP case, for example, the number of symbols to which the PSBCHis mapped after the S-SSS in the S-SSB may be 6, unlike FIG. 10.Therefore, the coverage of the S-SSB may be different depending onwhether the CP type is NCP or ECP.

Each SLSS may have a sidelink synchronization identifier (SLSS ID).

For example, in LTE SL or LTE V2X, the values of SLSS IDs may be definedbased on combinations of two different S-PSS sequences and 168 differentS-SSS sequences. For example, the number of SLSS IDs may be 336. Forexample, the value of an SLSS ID may be any one of 0 to 335.

For example, in NR SL or NR V2X, the values of SLSS IDs may be definedbased on combinations of two different S-PSS sequences and 336 differentS-SSS sequences. For example, the number of SLSS IDs may be 672. Forexample, the value of an SLSS ID may be any one of 0 to 671. Forexample, one of the two different S-PSSs may be associated within-coverage and the other S-PSS may be associated with out-of-coverage.For example, the SLSS ID of 0 to 335 may be used for in-coverage,whereas the SLSS IDs of 336 to 671 may be used for out-coverage.

In order to improve the S-SSB reception performance of the receiving UE,the transmitting UE needs to optimize transmission power according tothe characteristics of each signal included in the S-SSB. For example,the transmitting UE may determine a maximum power reduction (MPR) valuefor each signal included in the S-SSB according to the peak-to-averagepower ratio (PAPR) of the signal. For example, when the PAPR value isdifferent between the S-PSS and the S-SSS in the S-SSB, the transmittingUE may apply an optimal MPR value to each of the S-PSS and the S-SSS toimprove the S-SSB reception performance of the receiving UE. Forexample, a transition period may further be applied so that thetransmitting UE performs an amplification operation for each signal. Thetransition period may preserve a time required for a transmission-endamplifier of the transmitting UE to perform a normal operation at theboundary at which the transmission power of the transmitting UE ischanged. For example, the transition period may be 10 us in FR1, and 5us in FR2. For example, a search window in which the receiving UEdetects the S-PSS may be 80 ms and/or 160 ms.

FIG. 12 illustrates UEs that conduct V2X or SL communication betweenthem according to an embodiment of the present disclosure.

Referring to FIG. 12, the term “UE” in V2X or SL communication maymainly refer to a terminal of a user. However, when network equipmentsuch as a BS transmits and receives a signal according to a UE-to-UEcommunication scheme, the BS may also be regarded as a kind of UE. Forexample, a first UE (UE1) may be a first device 100 and a second UE(UE2) may be a second device 200.

For example, UE1 may select a resource unit corresponding to specificresources in a resource pool which is a set of resources. UE1 may thentransmit an SL signal in the resource unit. For example, UE2, which is areceiving UE, may be configured with the resource pool in which UE1 maytransmit a signal, and detect the signal from UE1 in the resource pool.

When UE1 is within the coverage of the BS, the BS may indicate theresource pool to UE1. On the contrary, when UE1 is outside the coverageof the BS, another UE may indicate the resource pool to UE1, or UE1 mayuse a predetermined resource pool.

In general, a resource pool may include a plurality of resource units,and each UE may select one or more resource units and transmit an SLsignal in the selected resource units.

FIG. 13 illustrates resource units for V2X or SL communication accordingto an embodiment of the present disclosure.

Referring to FIG. 13, the total frequency resources of a resource poolmay be divided into NF frequency resources, and the total time resourcesof the resource pool may be divided into NT time resources. Thus, atotal of NF*NT resource units may be defined in the resource pool. FIG.13 illustrates an example in which the resource pool is repeated with aperiodicity of NT subframes.

As illustrates in FIG. 13, one resource unit (e.g., Unit #0) may appearrepeatedly with a periodicity. Alternatively, to achieve a diversityeffect in the time or frequency domain, the index of a physical resourceunit to which one logical resource unit is mapped may change over timein a predetermined pattern. In the resource unit structure, a resourcepool may refer to a set of resource units available to a UE fortransmission of an SL signal.

Resource pools may be divided into several types. For example, eachresource pool may be classified as follows according to the content ofan SL signal transmitted in the resource pool.

(1) A scheduling assignment (SA) may be a signal including informationabout the position of resources used for a transmitting UE to transmitan SL data channel, a modulation and coding scheme (MCS) or multipleinput multiple output (MIMO) transmission scheme required for datachannel demodulation, a timing advertisement (TA), and so on. The SA maybe multiplexed with the SL data in the same resource unit, fortransmission. In this case, an SA resource pool may refer to a resourcepool in which an SA is multiplexed with SL data, for transmission. TheSA may be referred to as an SL control channel.

(2) An SL data channel (PSSCH) may be a resource pool used for atransmitting UE to transmit user data. When an SA is multiplexed with SLdata in the same resource unit, for transmission, only the SL datachannel except for SA information may be transmitted in a resource poolfor the SL data channel. In other words, REs used to transmit the SAinformation in an individual resource unit in an SA resource pool maystill be used to transmit SL data in the resource pool of the SL datachannel. For example, the transmitting UE may transmit the PSSCH bymapping the PSSCH to consecutive PRBs.

(3) A discovery channel may be a resource pool used for a transmittingUE to transmit information such as its ID. The transmitting UE mayenable a neighboring UE to discover itself on the discovery channel.

Even when SL signals have the same contents as described above,different resource pools may be used according to thetransmission/reception properties of the SL signals. For example, inspite of the same SL data channel or discovery message, a differentresources pool may be used for an SL signal according to a transmissiontiming determination scheme for the SL signal (e.g., whether the SLsignal is transmitted at a reception time of a synchronization referencesignal (RS) or at a time resulting from applying a predetermined TA tothe reception time), a resource allocation scheme for the SL signal(e.g., whether a BS allocates transmission resources of an individualsignal to an individual transmitting UE or whether the individualtransmitting UE selects its own individual signal transmission resourcesin the resource pool), the signal format of the SL signal (e.g., thenumber of symbols occupied by each SL signal in one subframe, or thenumber of subframes used for transmission of one SL signal), thestrength of a signal from the BS, the transmission power of the SL UE,and so on.

SCI will be described below.

While control information transmitted from a BS to a UE on a PDCCH isreferred to as DCI, control information transmitted from one UE toanother UE on a PSCCH may be referred to as SCI. For example, the UE mayknow the starting symbol of the PSCCH and/or the number of symbols inthe PSCCH before decoding the PSCCH. For example, the SCI may include SLscheduling information. For example, the UE may transmit at least oneSCI to another UE to schedule the PSSCH. For example, one or more SCIformats may be defined.

For example, the transmitting UE may transmit the SCI to the receivingUE on the PSCCH. The receiving UE may decode one SCI to receive thePSSCH from the transmitting UE.

For example, the transmitting UE may transmit two consecutive SCIs(e.g., 2-stage SCI) on the PSCCH and/or PSSCH to the receiving UE. Thereceiving UE may decode the two consecutive SCIs (e.g., 2-stage SCI) toreceive the PSSCH from the transmitting UE. For example, when SCIconfiguration fields are divided into two groups in consideration of a(relatively) large SCI payload size, SCI including a first SCIconfiguration field group is referred to as first SCI. SCI including asecond SCI configuration field group may be referred to as second SCI.For example, the transmitting UE may transmit the first SCI to thereceiving UE on the PSCCH. For example, the transmitting UE may transmitthe second SCI to the receiving UE on the PSCCH and/or PSSCH. Forexample, the second SCI may be transmitted to the receiving UE on an(independent) PSCCH or on a PSSCH in which the second SCI is piggybackedto data. For example, the two consecutive SCIs may be applied todifferent transmissions (e.g., unicast, broadcast, or groupcast).

For example, the transmitting UE may transmit all or part of thefollowing information to the receiving UE by SCI. For example, thetransmitting UE may transmit all or part of the following information tothe receiving UE by first SCI and/or second SCI.

-   -   PSSCH-related and/or PSCCH-related resource allocation        information, for example, the positions/number of time/frequency        resources, resource reservation information (e.g. a        periodicity), and/or    -   an SL channel state information (CSI) report request indicator        or SL (L1) RSRP (and/or SL (L1) reference signal received        quality (RSRQ) and/or SL (L1) received signal strength indicator        (RSSI)) report request indicator, and/or    -   an SL CSI transmission indicator (on PSSCH) (or SL (L1) RSRP        (and/or SL (L1) RSRQ and/or SL (L1) RSSI) information        transmission indicator), and/or    -   MCS information, and/or    -   transmission power information, and/or    -   L1 destination ID information and/or L1 source ID information,        and/or    -   SL HARQ process ID information, and/or    -   new data indicator (NDI) information, and/or    -   redundancy version (RV) information, and/or    -   QoS information (related to transmission traffic/packet), for        example, priority information, and/or    -   an SL CSI-RS transmission indicator or information about the        number of SL CSI-RS antenna ports (to be transmitted);    -   location information about a transmitting UE or location (or        distance area) information about a target receiving UE        (requested to transmit an SL HARQ feedback), and/or    -   RS (e.g., DMRS or the like) information related to decoding        and/or channel estimation of data transmitted on a PSSCH, for        example, information related to a pattern of (time-frequency)        mapping resources of the DMRS, rank information, and antenna        port index information.

For example, the first SCI may include information related to channelsensing. For example, the receiving UE may decode the second SCI usingthe PSSCH DMRS. A polar code used for the PDCCH may be applied to thesecond SCI. For example, the payload size of the first SCI may be equalfor unicast, groupcast and broadcast in a resource pool. After decodingthe first SCI, the receiving UE does not need to perform blind decodingon the second SCI. For example, the first SCI may include schedulinginformation about the second SCI.

In various embodiments of the present disclosure, since the transmittingUE may transmit at least one of the SCI, the first SCI, or the secondSCI to the receiving UE on the PSCCH, the PSCCH may be replaced with atleast one of the SCI, the first SCI, or the second SC. Additionally oralternatively, for example, the SCI may be replaced with at least one ofthe PSCCH, the first SCI, or the second SCI. Additionally oralternatively, for example, since the transmitting UE may transmit thesecond SCI to the receiving UE on the PSSCH, the PSSCH may be replacedwith the second SCI.

A cooperative awareness message (CAM) and a decentralized environmentalnotification message (DENM) will be described below.

For V2V communication, a CAM which is a periodic message type and a DENMwhich is an event-triggered message type may be transmitted. The CAM mayinclude basic vehicle information which includes dynamic stateinformation about a vehicle such as a direction and a speed, staticvehicle data such as dimensions, an external illumination state, andpath details. The CAM may be 50 to 300 bytes long. The CAM is broadcastand should have a latency less than 100 ms. The DENM may be a messagegenerated upon occurrence of a sudden incident such as vehicle breakdownand an accident. The DENM may be shorter than 3000 bytes, and allvehicles within a transmission range may receive the DENM. The DENM mayhave priority over the CAM.

SL measurement and reporting will be described below.

For the purpose of QoS prediction, initial transmission parametersetting, link adaptation, link management, admission control, and so on,SL measurement and reporting (e.g., measurement and reporting of an RSRPor an RSRQ) between UEs may be considered in SL. For example, an RX-UEmay receive an RS from a TX-UE and measure the channel state of theTX-UE based on the RS. Further, the RX-UE may report CSI to the TX-UE.SL measurement and reporting may include measurement and reporting of aCBR and reporting of location information. Examples of CSI for V2X mayinclude a channel quality indicator (CQI), a precoding matrix index(PMI), a rank indicator (RI), an RSRP, an RSRQ, a path gain/pathloss, anSRS resource indicator (SRI), a CSI-RS resource indicator (CRI), aninterference condition, a vehicle motion, and so on. For unicastcommunication, a CQI, an RI, and a PMI or some of them may be supportedin a non-subband-based aperiodic CSI report based on the assumption offour or fewer antenna ports. The CSI procedure may not depend on astandalone RS. CSI reporting may be activated and deactivated dependingon a configuration.

For example, the TX-UE may transmit a channel stateinformation-reference signal (CSI-RS) to the RX-UE, and the RX-UE maymeasure a CQI or an RI using the CSI-RS. For example, the CSI-RS may bereferred to as an SL CSI-RS. For example, the CSI-RS may be confined towithin a PSSCH transmission. For example, the TX-UE may transmit theCSI-RS in a PSSCH resource to the RX-UE.

A BWP and a resource pool will be described below.

When bandwidth adaptation (BA) is used, the reception bandwidth andtransmission bandwidth of a UE need not be as large as the bandwidth ofa cell, and may be adjusted. For example, the network/BS may inform theUE of the bandwidth adjustment. For example, the UE may receiveinformation/a configuration for bandwidth adjustment from thenetwork/BS. In this case, the UE may perform bandwidth adjustment basedon the received information/configuration. For example, the bandwidthadjustment may include a decrease/increase of the bandwidth, a change inthe position of the bandwidth, or a change in the SCS of the bandwidth.

For example, the bandwidth may be reduced during a time period of lowactivity in order to save power. For example, the position of thebandwidth may be shifted in the frequency domain. For example, theposition of the bandwidth may be shifted in the frequency domain toincrease scheduling flexibility. For example, the SCS of the bandwidthmay be changed. For example, the SCS of the bandwidth may be changed toallow a different service. A subset of the total cell bandwidth of acell may be referred to as a BWP. BA may be implemented by configuringBWPs for the UE and indicating a current active BWP among the configuredBWPs to the UE by the BS/network.

FIG. 15 illustrates a plurality of BWPs according to an embodiment ofthe present disclosure.

Referring to FIG. 15, BWP1 having a bandwidth of 40 MHz and an SCS of 15kHz, BWP2 having a bandwidth of 10 MHz and an SCS of 15 kHz, and BWP3having a bandwidth of 20 MHz and an SCS of 60 kHz may be configured.

FIG. 16 illustrates BWPs according to an embodiment of the presentdisclosure. In the embodiment of FIG. 30, it is assumed that there arethree BWPs.

Referring to FIG. 16, common resource blocks (CRBs) may be carrier RBsnumbered from one end of a carrier band to the other end of the carrierband. PRBs may be RBs numbered within each BWP. A point A may indicate acommon reference point for a resource block grid.

A BWP may be configured by the point A, an offset NstartBWP from thepoint A, and a bandwidth NsizeBWP. For example, the point A may be anexternal reference point for a PRB of a carrier, in which subcarrier 0is aligned for all numerologies (e.g., all numerologies supported in thecarrier by the network). For example, the offset may be a PRB intervalbetween the lowest subcarrier for a given numerology and the point A.For example, the bandwidth may be the number of PRBs for the giventechnology.

A BWP may be defined for SL. The same SL BWP may be used fortransmission and reception. For example, a transmitting UE may transmitan SL channel or an SL signal in a specific BWP, and a receiving UE mayreceive the SL channel or the SL signal in the specific BWP. In alicensed carrier, an SL BWP may be defined separately from a Uu BWP, andhave separate configuration signaling from the Uu BWP. For example, a UEmay receive a configuration for the SL BWP from the BS/network. The SLBWP may be (pre)configured for an out-of-coverage NR V2X UE and anRRC_IDLE UE in the carrier. For a UE in RRC_CONNECTED mode, at least oneSL BWP may be activated in the carrier.

A resource pool may be a set of time-frequency resources available forSL transmission and/or SL reception. From the viewpoint of a UE,time-domain resources of a resource pool may not be contiguous. Aplurality of resource pools may be (pre)configured for the UE in onecarrier. From the viewpoint of the PHY layer, the UE may performunicast, groupcast, and broadcast communication using a configured orpreconfigured resource pool.

In an NR system, up to four BWPs each representing a continuous set ofRBs may be allocated to a UE, and one of the four BWPs may be activatedand used. Each BWP may be configured with a different numerology (e.g.,SCS, TTI, and so on). In the present disclosure, however, multiple BWPsmay be activated and used to mitigate inter-carrier interference(ICI)/inter-symbol interference (ISI) which may occur between links inV2X communication or efficiently use resources.

FIG. 17 is a diagram illustrating the types of links between UEs in aBWP.

Referring to FIG. 17a , when a plurality of UEs are synchronized witheach other by global sync, one UE, UE 0 may establish a link with eachof the plurality of UEs in a unicast manner.

Alternatively, a plurality of UEs may establish links with anotherplurality of UEs in a unicast manner during the same time period andcommunicate with each other on the links, as illustrated in FIG. 17b .When a plurality of links operate in one BWP as such, ISI/ICI may occurto communication links, thereby degrading communication performance.

FIG. 18 is a diagram illustrating OFDM symbols transmitted on each of aplurality of links.

Referring to FIG. 18, when communication is performed simultaneously ona plurality of unicast links (e.g., when the unicast links aremultiplexed in FDM) as described above, OFDM symbols transmitted on therespective links at a specific time may be received at different timepoints due to propagation delays. Accordingly, for example, when a UEperforms FFT1 corresponding to data 1 to decode the value of data 1transmitted on link 1, ISI/ICI may occur due to OFDM symbols of link 3and link 4 exceeding the length of the CP of the signal of link 1,thereby degrading communication performance.

To solve the above problem, when a plurality of BWPs are used in FDMwithin a carrier, each link between UEs may be allocated to anappropriate BWP. For example, when links 1 and 2 and links 3 and 4 areallocated to different BWPs, mutual interference and ICI/ISI-causedperformance degradation may be reduced. That is, when an OFDM symbol ofanother UE exceeding the CP length is allocated to a BWP other than aBWP of the UE, RF filtering may be performed on a BWP basis, and thusICI/ISI does not occur.

Further, BWPs may be allocated based on a signal type. For example,different numerologies may be required for transmission of a discoverysignal or discovery message and for data transmission. Specifically, thediscovery signal may detect even a remote communicable UE by using anextended CP, and subsequent data communication may be performed with anumerology corresponding to a data requirement. Therefore, the UE maydistinguish a BWP for discovery and a BWP for data transmission fromeach other, thereby increasing the communication performance of eachlink. For example, the UE may configure a new BWP area for communicationin the BWP for transmission and reception of a discovery signal or mayperform communication by switching to a predetermined BWP.

Various embodiments of transmitting and receiving a discovery signal ora data signal more efficiently by using a plurality of BWPs at a UE willbe disclosed below. For convenience of description, a single UE (e.g.,UE 0) establishes unicast links with a plurality of UEs (e.g., UE 1 toUE 4), by way of example, which should not be construed as limiting.

When each of UE 1 to UE 4 transmits a discovery signal to communicatewith UE 0, the discovery signal may be transmitted in a pre-agreed (orpredetermined/preconfigured/common) BWP, particularly based on theextended CP to reduce communication performance loss caused by apropagation delay (i.e., to detect even a remote UE).

FIG. 19 is a diagram illustrating a discovery signal transmitted on eachof a plurality of links.

Referring to FIG. 19, discovery signals with the extended CPstransmitted in a BWP for discovery signal transmission by UE 1 to UE 4may be received at different time points. The BWP for discovery signaltransmission may be, for example, BWP 3.

Upon receipt of the discovery signal from each of the UEs, UE 0calculates a delay spread value based on the received discovery signal.For example, the UE may calculate a correlation value and calculate thedelay spread value of each of UE 1 to UE 4 by using a positioncorresponding to a peak in the calculated value. More specifically, UE 0may calculate a correlation value between the symbol value of a CPperiod of an OFDM symbol in the discovery signal received from each UEand the symbol value of a CP period spaced apart from the CP period byone OFDM symbol length, and calculate a delay spread value for the UEbased on a specific time or period corresponding to the highest ofcalculated correlation values, that is, a peak value.

Alternatively, the UE may use the sum of the delay spread valuecalculated in the above process and a delay-tolerable margin value, asan estimated delay spread value. The margin value is a value added tothe calculated delay spread value, which may be one of values includedin a predetermined range. A different method of calculating a delayspread value may be used depending on implementation of a UE receiver.

When the extended CP is used for data communication of UE 0 to UE 4 asis done for the discovery signal, all transmitted data symbols mayarrive at UE 0 within a CP length. In this case, ICI/ISI may not occur.In data communication, however, when communication is possible using thenormal CP without ICI/ISI, this may be more efficient in terms ofresource use or latency.

Therefore, according to an embodiment of the present disclosure, the UEmay allocate one of a plurality of BWPs each using one of the normal CPand the extended CP to each UE based on a delay spread value obtainedfrom a discovery signal. For example, UE 0 may allocate BWPs to UE 1 toUE 4 based on delay spread values of UE 1 to UE 4 estimated fromdiscovery signals.

More specifically, a specific BWP (e.g., BWP 1) may be allocated to a UEhaving a delay spread value calculated by UE 0 included within thelength of the normal CP. In other words, depending on whether thecalculated delay spread value is included within the length of thenormal CP, a different BWP for SL communication may be allocated to eachUE. Alternatively, a different BWP for SL communication may be allocatedto each UE according to whether the delay spread value of the UEcalculated by UE 0 is equal to or larger than (n−1) times to n times thelength of the normal CP. For example, another specific BWP (e.g., BWP 2)may be allocated to a UE having a delay spread value included withintwice the length of the normal CP, that is, a delay spread value largerthan the length of the normal CP and equal to or less than twice thelength of the normal CP. Alternatively, another specific BWP may beallocated to a UE having a delay spread value calculated by UE 0included within three times the length of the normal CP, that is, adelay spread value larger than twice the length of the normal CP andequal to or less than three times the length of the normal CP.

FIGS. 20 and 21 are diagrams illustrating a BWP allocation methodaccording to an embodiment of the present disclosure.

Referring to FIG. 20, UE 0 may estimate or calculate a delay spreadvalue for each UE from a discovery signal of the UE and then allocate aBWP to the UE based on the calculated delay spread value (in this case,synchronization may be acquired independently on a BWP basis), asdescribed above. Specifically, because UE 0 is capable of receivingsignals from UE 1 and UE 2 within a CP length, UE 0 may allocate any oneBWP (e.g., BWP 1) to UE 1 and UE 2. Further, because UE 0 is capable ofreceiving signals from UE 3 and UE 4 within the CP length, UE 0 mayallocate another BWP (e.g., BWP 2) to UE 3 and UE 4. Accordingly, UE 0may receive OFDM symbols without exceeding the CP length in BWP 1 andBWP 2, thereby mitigating ICI/ISI. In other words, when a plurality ofBWPs are used, communication may be performed without ICI/ISI betweenlinks in spite of use of the normal CP, and decoding performance may beincreased, compared to communication in a single BWP.

Referring to FIG. 21, BWPs may be allocated in FDM on a UE basis and ona signal type basis according to the afore-described BWP allocationmethod. BWP 3 may be allocated for discovery transmission/reception, andBWP 1 and BWP 2 may be allocated on a UE basis based on a delay spreadvalue calculated by a receiving UE. BWP 1 and BWP 2 may have the samenumerology or may have different numerologies according to servicerequirements. When a BWP for discovery signal transmission and a BWP fordata transmission are allocated in FDM in this manner, a connectionbetween UEs may be recovered fast by using the BWP allocated fordiscovery signals, even though the UEs are disconnected during datacommunication.

A UE may indicate a BWP used for data communication, that is, BWPallocation information to another UE by using a BWP in which a discoverymessage is transmitted. For example, UE 0 which allocates a BWP mayindicate the ID of one other UE to communicate with and a BWP to be usedfor the communication to the other UE through the BWP carrying adiscovery signal (e.g., using the extended CP). The BWP to be used, thatis, the BWP to be used for data communication may be indicated to theother UE by indicating a preconfigured index of the BWP. In other words,the BWP allocation information may include the index of the allocatedBWP.

As described above, the BWP area used for data communication may be aBWP indicated by UE 0 (e.g., an index allocated by the UE) as describedabove. Alternatively, a separate negotiation process may be performed todetermine a BWP for each UE based on the BWP indicated by UE 0.Alternatively, UE 0 may recommend a BWP to each of UE 1 to UE 4 so thatthe UE may use the recommended BWP. A UE to which UE 0 recommends aspecific BWP may use the recommended BWP or another BWP. When the UEuses a BWP other than the recommended BWP, the UE may indicate the usedBWP through a BWP used for discovery signal transmission (or a commonBWP).

FIG. 22 is a diagram illustrating a BWP allocation method according toanother embodiment of the present disclosure.

Referring to FIG. 22, a plurality of BWPs (e.g., BWP 1 to BWP 3) may beused in TDM in the time domain. That is, the plurality of BWPs may beallocated to different time resources in the time domain.

Accordingly, each UE may detect an available UE for communication byperforming a discovery procedure in a BWP allocated for discovery signaltransmission, and use a suitable for data communication throughscheduling in TDM.

Specifically, the BWP for a discovery signal may be periodicallyallocated to a UE, and thus the discovery procedure for detecting anavailable UE for communication may also be periodically performed.Further, a BWP suitable for each UE may be dynamically allocated to theUE based on a discovery signal. A process of allocating a suitable BWPto each UE based on a discovery signal may be performed, for example,according to the afore-described spread delay-based BWP allocationmethod.

FIG. 23 is a diagram illustrating a BWP allocation method according toanother embodiment of the present disclosure.

Referring to FIG. 23, a BWP for discovery signal transmission (e.g., BWP3) and the other BWPs for data communication may be used in TDM, and theBWPs for data communication may be sued in FDM. That is, the BWP fordiscovery signal transmission and the BWPs for transmission of a SLsignal (e.g., an SL control signal or data signal) may be allocated todifferent time resources in the time domain, and when there are aplurality of BWPs for SL signal transmission, the plurality of BWPs forSL signal transmission may be allocated to different frequency resourcesin the frequency domain. In this case, a UE may allocate BWPs suitablefor data communication to a plurality of UEs based on discovery signalsreceived from the UEs in the BWP for discovery signal transmission.

FIG. 24 is a diagram illustrating a time gap configuration methodaccording to an embodiment of the present disclosure.

Referring to FIG. 24, there may be a need for a time gap for transition,when BWPs are operated in the above-described TDM manner. The time gapmay be given by indicating a predetermined time between BWPs. In otherwords, the time gap may be allocated to be located between BWPs whichare multiplexed in TDM in the time domain.

Alternatively, the time gap may be an area included in a BWP. When thetime gap is included in a BWP, a few symbols or sub-slots at a BWPboundary may be used as a transition gap. For example, n symbols fromthe last symbol in the time domain among a plurality of symbols includedin a BWP may be configured as the time gap (n is a natural number).

When a UE is capable of receiving signals in all of a plurality of BWPsby using a single RF and the numerologies of all used BWPs areidentical, the time gap for transition may not be needed. Therefore, thepresence or absence of a time gap/the length of the time gap may becontrolled configurably.

FIG. 25 is a flowchart illustrating a BWP allocation method according toan embodiment of the present disclosure.

Referring to FIG. 25, a plurality of Tx UEs may transmit a plurality ofdiscovery signals to an Rx UE in a BWP allocated for discovery inoperation S1201. In operation S1203, the Rx UE may calculate a delayspread value for each of the plurality of Tx UEs based on the discoverysignal received from the Tx UE. In operation S1205, the Rx UE mayallocate a suitable BWP to each of the plurality of Tx UEs based on thecalculated delay spread value. In operation S1207, the Tx UEs and the RxUE may transmit and receive SL control signals or data signals in theallocated BWPs.

FIG. 26 is a flowchart illustrating an SL signal transmission methodaccording to an embodiment of the present disclosure.

Referring to FIG. 26, a UE may receive a plurality of discovery signalsfrom a plurality of other UEs in one of a plurality of BWPs in operationS1301. The one BWP may be configured to be used only with an extendedCP.

In operation S1303, the UE may transmit allocation information about theremaining BWPs except for the one BWP among the plurality of BWPs in theone BWP, based on delay spread values of the plurality of discoverysignals. The remaining BWPs may be configured to be used only with anormal CP.

The allocation information may include the index of a BWP allocated toeach of a plurality of UEs which have transmitted the plurality ofdiscovery signals. The remaining BWPs may be allocated differently forthe plurality of UEs which have transmitted the plurality of discoverysignals based on the delay spread values being included in the length ofthe normal CP. More specifically, based on the delay spread values beingequal to or larger than (n−1) times the length of the normal CP and lessthan n times the length of the normal CP, the remaining BWPs may beallocated differently for the plurality of UEs which have transmittedthe plurality of discovery signals.

The one BWP and the remaining BWPs may be allocated to differentresources in the time domain, that is, in TDM. A time gap may beconfigured between the one BWP and each of the remaining BWPs.

In operation S1305, the UE may receive a plurality of SL control signalsand data signals in the remaining BWPs.

According to the above-described various example of the presentdisclosure, when a UE widens a range for detecting an available UE forcommunication by using an extended CP for discovery signal transmissionand performs actual data communication with a detected UE by using anormal CP, resources may be used more efficiently. While the presentdisclosure has been described in the context of SL communication by wayof example, it is obvious that the present disclosure is applicable tocommunication between a BS and a UE corresponding to a Uu interface.

It is obvious that each of the examples of the proposed methods may alsobe included as one of various embodiments of the present disclosure, andthus each example may be regarded as a kind of proposed method. Althoughthe proposed methods may be implemented independently, some of theproposed methods may be combined (or merged) and implemented. Themethods proposed in the present disclosure have been described in thecontext of the 3GPP NR system for convenience of description, the scopeof systems to which the proposed methods are applied may be extended toother systems in addition to the 3GPP NR system. For example, theproposed methods of the present disclosure may be extended and appliedto D2D communication. Here, D2D communication refers to directcommunication between UEs over a radio channel. Although the UE means auser terminal, a network equipment such as a BS may also be regarded asa kind of UE if the network equipment transmits and receives a signalaccording to UE-to-UE communication schemes. In addition, the proposedmethods of the present disclosure may be limitedly applied to MODE 3 V2Xoperations (and/or MODE 4 V2X operations). For example, the proposedmethods of the present disclosure may be limitedly applied totransmission of a preconfigured (and/or signaled) (specific) V2X channel(and/or signal) (e.g., PSSCH (and/or (related) PSCCH and/or PSBCH)). Forexample, the proposed methods of the present disclosure may be limitedlyapplied when a PSSCH and a PSCCH (related thereto) are transmitted suchthat they are located to be adjacent (and/or non-adjacent) (in thefrequency domain) (and/or when transmission is performed based on thevalue (and/or range) of a preconfigured (and/or signaled) MCS (codingrate and/or RB). For example, the proposed methods of the presentdisclosure may be limitedly applied to MODE 3 (and/or MODE 4) V2Xcarriers (MODE 4 (and/or 3) SL (and/or UL) SPS carriers and/or MODE 4(and/or 3) dynamic scheduling carriers). Moreover, the proposed methodsof the present disclosure may be (limitedly) applied when the positionsand/or number of synchronization signal (transmission (and/orreception)) resources (and/or the positions and/or number of subframesin a V2X resource pool (and/or the size and number of sub-channels)) arethe same (and/or (partially) different) between carriers. For example,the proposed methods of the present disclosure may be extended andapplied to (V2X) communication between a BS and a UE. For example, theproposed methods of the present disclosure may be limitedly applied tounicast (SL) communication (and/or multicast (or groupcast) (SL)communication and/or broadcast (SL) communication).

Example of Communication System to which the Present Disclosure isApplied

The various descriptions, functions, procedures, proposals, methods,and/or operational flowcharts of the present disclosure described inthis document may be applied to, without being limited to, a variety offields requiring wireless communication/connection (e.g., 5G) betweendevices.

Hereinafter, a description will be given in more detail with referenceto the drawings. In the following drawings/description, the samereference symbols may denote the same or corresponding hardware blocks,software blocks, or functional blocks unless described otherwise.

FIG. 32 illustrates a communication system 1 applied to the presentdisclosure.

Referring to FIG. 32, a communication system 1 applied to the presentdisclosure includes wireless devices, Base Stations (BSs), and anetwork. Herein, the wireless devices represent devices performingcommunication using Radio Access Technology (RAT) (e.g., 5G New RAT(NR)) or Long-Term Evolution (LTE)) and may be referred to ascommunication/radio/5G devices. The wireless devices may include,without being limited to, a robot 100 a, vehicles 100 b-1 and 100 b-2,an eXtended Reality (XR) device 100 c, a hand-held device 100 d, a homeappliance 100 e, an Internet of Things (IoT) device 100 f, and anArtificial Intelligence (AI) device/server 400. For example, thevehicles may include a vehicle having a wireless communication function,an autonomous driving vehicle, and a vehicle capable of performingcommunication between vehicles. Herein, the vehicles may include anUnmanned Aerial Vehicle (UAV) (e.g., a drone). The XR device may includean Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) deviceand may be implemented in the form of a Head-Mounted Device (HMD), aHead-Up Display (HUD) mounted in a vehicle, a television, a smartphone,a computer, a wearable device, a home appliance device, a digitalsignage, a vehicle, a robot, etc. The hand-held device may include asmartphone, a smartpad, a wearable device (e.g., a smartwatch orsmartglasses), and a computer (e.g., a notebook). The home appliance mayinclude a TV, a refrigerator, and a washing machine. The IoT device mayinclude a sensor and a smartmeter. For example, the BSs and the networkmay be implemented as wireless devices and a specific wireless device200 a may operate as a BS/network node with respect to other wirelessdevices.

The wireless devices 100 a to 100 f may be connected to the network 300via the BSs 200. An AI technology may be applied to the wireless devices100 a to 100 f and the wireless devices 100 a to 100 f may be connectedto the AI server 400 via the network 300. The network 300 may beconfigured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g.,NR) network. Although the wireless devices 100 a to 100 f maycommunicate with each other through the BSs 200/network 300, thewireless devices 100 a to 100 f may perform direct communication (e.g.,sidelink communication) with each other without passing through theBSs/network. For example, the vehicles 100 b-1 and 100 b-2 may performdirect communication (e.g. Vehicle-to-Vehicle(V2V)/Vehicle-to-everything (V2X) communication). The IoT device (e.g.,a sensor) may perform direct communication with other IoT devices (e.g.,sensors) or other wireless devices 100 a to 100 f.

Wireless communication/connections 150 a, 150 b, or 150 c may beestablished between the wireless devices 100 a to 100 f/BS 200, or BS200/BS 200. Herein, the wireless communication/connections may beestablished through various RATs (e.g., 5G NR) such as uplink/downlinkcommunication 150 a, sidelink communication 150 b (or, D2Dcommunication), or inter BS communication (e.g. relay, Integrated AccessBackhaul (IAB)). The wireless devices and the BSs/the wireless devicesmay transmit/receive radio signals to/from each other through thewireless communication/connections 150 a and 150 b. For example, thewireless communication/connections 150 a and 150 b may transmit/receivesignals through various physical channels. To this end, at least a partof various configuration information configuring processes, varioussignal processing processes (e.g., channel encoding/decoding,modulation/demodulation, and resource mapping/demapping), and resourceallocating processes, for transmitting/receiving radio signals, may beperformed based on the various proposals of the present disclosure.

Example of Wireless Devices to which the Present Disclosure is Applied

FIG. 33 illustrates wireless devices applicable to the presentdisclosure.

Referring to FIG. 33, a first wireless device 100 and a second wirelessdevice 200 may transmit radio signals through a variety of RATs (e.g.,LTE and NR). Herein, {the first wireless device 100 and the secondwireless device 200} may correspond to {the wireless device 100 x andthe BS 200} and/or {the wireless device 100 x and the wireless device100 x} of FIG. 32.

The first wireless device 100 may include one or more processors 102 andone or more memories 104 and additionally further include one or moretransceivers 106 and/or one or more antennas 108. The processor(s) 102may control the memory(s) 104 and/or the transceiver(s) 106 and may beconfigured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 102 may process informationwithin the memory(s) 104 to generate first information/signals and thentransmit radio signals including the first information/signals throughthe transceiver(s) 106. The processor(s) 102 may receive radio signalsincluding second information/signals through the transceiver 106 andthen store information obtained by processing the secondinformation/signals in the memory(s) 104. The memory(s) 104 may beconnected to the processor(s) 102 and may store a variety of informationrelated to operations of the processor(s) 102. For example, thememory(s) 104 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 102or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 102 and the memory(s) 104 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 106 may be connected to the processor(s) 102 andtransmit and/or receive radio signals through one or more antennas 108.Each of the transceiver(s) 106 may include a transmitter and/or areceiver. The transceiver(s) 106 may be interchangeably used with RadioFrequency (RF) unit(s). In the present disclosure, the wireless devicemay represent a communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202and one or more memories 204 and additionally further include one ormore transceivers 206 and/or one or more antennas 208. The processor(s)202 may control the memory(s) 204 and/or the transceiver(s) 206 and maybe configured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 202 may process informationwithin the memory(s) 204 to generate third information/signals and thentransmit radio signals including the third information/signals throughthe transceiver(s) 206. The processor(s) 202 may receive radio signalsincluding fourth information/signals through the transceiver(s) 106 andthen store information obtained by processing the fourthinformation/signals in the memory(s) 204. The memory(s) 204 may beconnected to the processor(s) 202 and may store a variety of informationrelated to operations of the processor(s) 202. For example, thememory(s) 204 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 202or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 202 and the memory(s) 204 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 206 may be connected to the processor(s) 202 andtransmit and/or receive radio signals through one or more antennas 208.Each of the transceiver(s) 206 may include a transmitter and/or areceiver. The transceiver(s) 206 may be interchangeably used with RFunit(s). In the present disclosure, the wireless device may represent acommunication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 willbe described more specifically. One or more protocol layers may beimplemented by, without being limited to, one or more processors 102 and202. For example, the one or more processors 102 and 202 may implementone or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP,RRC, and SDAP). The one or more processors 102 and 202 may generate oneor more Protocol Data Units (PDUs) and/or one or more Service Data Unit(SDUs) according to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document. Theone or more processors 102 and 202 may generate messages, controlinformation, data, or information according to the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document. The one or more processors 102 and 202 maygenerate signals (e.g., baseband signals) including PDUs, SDUs,messages, control information, data, or information according to thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document and provide thegenerated signals to the one or more transceivers 106 and 206. The oneor more processors 102 and 202 may receive the signals (e.g., basebandsignals) from the one or more transceivers 106 and 206 and acquire thePDUs, SDUs, messages, control information, data, or informationaccording to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.

The one or more processors 102 and 202 may be referred to ascontrollers, microcontrollers, microprocessors, or microcomputers. Theone or more processors 102 and 202 may be implemented by hardware,firmware, software, or a combination thereof. As an example, one or moreApplication Specific Integrated Circuits (ASICs), one or more DigitalSignal Processors (DSPs), one or more Digital Signal Processing Devices(DSPDs), one or more Programmable Logic Devices (PLDs), or one or moreField Programmable Gate Arrays (FPGAs) may be included in the one ormore processors 102 and 202. The descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument may be implemented using firmware or software and the firmwareor software may be configured to include the modules, procedures, orfunctions. Firmware or software configured to perform the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be included in the one or more processors102 and 202 or stored in the one or more memories 104 and 204 so as tobe driven by the one or more processors 102 and 202. The descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be implemented using firmware or softwarein the form of code, commands, and/or a set of commands.

The one or more memories 104 and 204 may be connected to the one or moreprocessors 102 and 202 and store various types of data, signals,messages, information, programs, code, instructions, and/or commands.The one or more memories 104 and 204 may be configured by Read-OnlyMemories (ROMs), Random Access Memories (RAMs), Electrically ErasableProgrammable Read-Only Memories (EPROMs), flash memories, hard drives,registers, cash memories, computer-readable storage media, and/orcombinations thereof. The one or more memories 104 and 204 may belocated at the interior and/or exterior of the one or more processors102 and 202. The one or more memories 104 and 204 may be connected tothe one or more processors 102 and 202 through various technologies suchas wired or wireless connection.

The one or more transceivers 106 and 206 may transmit user data, controlinformation, and/or radio signals/channels, mentioned in the methodsand/or operational flowcharts of this document, to one or more otherdevices. The one or more transceivers 106 and 206 may receive user data,control information, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, from one or moreother devices. For example, the one or more transceivers 106 and 206 maybe connected to the one or more processors 102 and 202 and transmit andreceive radio signals. For example, the one or more processors 102 and202 may perform control so that the one or more transceivers 106 and 206may transmit user data, control information, or radio signals to one ormore other devices. The one or more processors 102 and 202 may performcontrol so that the one or more transceivers 106 and 206 may receiveuser data, control information, or radio signals from one or more otherdevices. The one or more transceivers 106 and 206 may be connected tothe one or more antennas 108 and 208 and the one or more transceivers106 and 206 may be configured to transmit and receive user data, controlinformation, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, through the one ormore antennas 108 and 208. In this document, the one or more antennasmay be a plurality of physical antennas or a plurality of logicalantennas (e.g., antenna ports). The one or more transceivers 106 and 206may convert received radio signals/channels etc. from RF band signalsinto baseband signals in order to process received user data, controlinformation, radio signals/channels, etc. using the one or moreprocessors 102 and 202. The one or more transceivers 106 and 206 mayconvert the user data, control information, radio signals/channels, etc.processed using the one or more processors 102 and 202 from the baseband signals into the RF band signals. To this end, the one or moretransceivers 106 and 206 may include (analog) oscillators and/orfilters.

Example of a Vehicle or an Autonomous Driving Vehicle to which thePresent Disclosure is Applied

FIG. 34 illustrates a vehicle or an autonomous driving vehicle appliedto the present disclosure. The vehicle or autonomous driving vehicle maybe implemented by a mobile robot, a car, a train, a manned/unmannedAerial Vehicle (AV), a ship, etc.

Referring to FIG. 34, a vehicle or autonomous driving vehicle 100 mayinclude an antenna unit 108, a communication unit 110, a control unit120, a driving unit 140 a, a power supply unit 140 b, a sensor unit 140c, and an autonomous driving unit 140 d. The antenna unit 108 may beconfigured as a part of the communication unit 110. The blocks110/130/140 a to 140 d correspond to the blocks 110/130/140 of FIG. 32,respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from external devices such as othervehicles, BSs (e.g., gNBs and road side units), and servers. The controlunit 120 may perform various operations by controlling elements of thevehicle or the autonomous driving vehicle 100. The control unit 120 mayinclude an Electronic Control Unit (ECU). The driving unit 140 a maycause the vehicle or the autonomous driving vehicle 100 to drive on aroad. The driving unit 140 a may include an engine, a motor, apowertrain, a wheel, a brake, a steering device, etc. The power supplyunit 140 b may supply power to the vehicle or the autonomous drivingvehicle 100 and include a wired/wireless charging circuit, a battery,etc. The sensor unit 140 c may acquire a vehicle state, ambientenvironment information, user information, etc. The sensor unit 140 cmay include an Inertial Measurement Unit (IMU) sensor, a collisionsensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor,a heading sensor, a position module, a vehicle forward/backward sensor,a battery sensor, a fuel sensor, a tire sensor, a steering sensor, atemperature sensor, a humidity sensor, an ultrasonic sensor, anillumination sensor, a pedal position sensor, etc. The autonomousdriving unit 140 d may implement technology for maintaining a lane onwhich a vehicle is driving, technology for automatically adjustingspeed, such as adaptive cruise control, technology for autonomouslydriving along a determined path, technology for driving by automaticallysetting a path if a destination is set, and the like.

For example, the communication unit 110 may receive map data, trafficinformation data, etc. from an external server. The autonomous drivingunit 140 d may generate an autonomous driving path and a driving planfrom the obtained data. The control unit 120 may control the drivingunit 140 a such that the vehicle or the autonomous driving vehicle 100may move along the autonomous driving path according to the driving plan(e.g., speed/direction control). In the middle of autonomous driving,the communication unit 110 may aperiodically/periodically acquire recenttraffic information data from the external server and acquiresurrounding traffic information data from neighboring vehicles. In themiddle of autonomous driving, the sensor unit 140 c may obtain a vehiclestate and/or surrounding environment information. The autonomous drivingunit 140 d may update the autonomous driving path and the driving planbased on the newly obtained data/information. The communication unit 110may transfer information about a vehicle position, the autonomousdriving path, and/or the driving plan to the external server. Theexternal server may predict traffic information data using AItechnology, etc., based on the information collected from vehicles orautonomous driving vehicles and provide the predicted trafficinformation data to the vehicles or the autonomous driving vehicles.

Examples of AR/VR and Vehicle to which the Present Disclosure is Applied

FIG. 35 illustrates a vehicle applied to the present disclosure. Thevehicle may be implemented as a transport means, an aerial vehicle, aship, etc.

Referring to FIG. 35, a vehicle 100 may include a communication unit110, a control unit 120, a memory unit 130, an I/O unit 140 a, and apositioning unit 140 b.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from external devices such as other vehiclesor BSs. The control unit 120 may perform various operations bycontrolling constituent elements of the vehicle 100. The memory unit 130may store data/parameters/programs/code/commands for supporting variousfunctions of the vehicle 100. The I/O unit 140 a may output an AR/VRobject based on information within the memory unit 130. The I/O unit 140a may include an HUD. The positioning unit 140 b may acquire informationabout the position of the vehicle 100. The position information mayinclude information about an absolute position of the vehicle 100,information about the position of the vehicle 100 within a travelinglane, acceleration information, and information about the position ofthe vehicle 100 from a neighboring vehicle. The positioning unit 140 bmay include a GPS and various sensors.

As an example, the communication unit 110 of the vehicle 100 may receivemap information and traffic information from an external server andstore the received information in the memory unit 130. The positioningunit 140 b may obtain the vehicle position information through the GPSand various sensors and store the obtained information in the memoryunit 130. The control unit 120 may generate a virtual object based onthe map information, traffic information, and vehicle positioninformation and the I/O unit 140 a may display the generated virtualobject in a window in the vehicle (1410 and 1420). The control unit 120may determine whether the vehicle 100 normally drives within a travelinglane, based on the vehicle position information. If the vehicle 100abnormally exits from the traveling lane, the control unit 120 maydisplay a warning on the window in the vehicle through the I/O unit 140a. In addition, the control unit 120 may broadcast a warning messageregarding driving abnormity to neighboring vehicles through thecommunication unit 110. According to situation, the control unit 120 maytransmit the vehicle position information and the information aboutdriving/vehicle abnormality to related organizations.

Examples of XR Device to which the Present Disclosure is Applied

FIG. 36 illustrates an XR device applied to the present disclosure. TheXR device may be implemented by an HMD, an HUD mounted in a vehicle, atelevision, a smartphone, a computer, a wearable device, a homeappliance, a digital signage, a vehicle, a robot, etc.

Referring to FIG. 36, an XR device 100 a may include a communicationunit 110, a control unit 120, a memory unit 130, an I/O unit 140 a, asensor unit 140 b, and a power supply unit 140 c.

The communication unit 110 may transmit and receive signals (e.g., mediadata and control signals) to and from external devices such as otherwireless devices, hand-held devices, or media servers. The media datamay include video, images, and sound. The control unit 120 may performvarious operations by controlling constituent elements of the XR device100 a. For example, the control unit 120 may be configured to controland/or perform procedures such as video/image acquisition, (video/image)encoding, and metadata generation and processing. The memory unit 130may store data/parameters/programs/code/commands needed to drive the XRdevice 100 a/generate XR object. The I/O unit 140 a may obtain controlinformation and data from the exterior and output the generated XRobject. The I/O unit 140 a may include a camera, a microphone, a userinput unit, a display unit, a speaker, and/or a haptic module. Thesensor unit 140 b may obtain an XR device state, surrounding environmentinformation, user information, etc. The sensor unit 140 b may include aproximity sensor, an illumination sensor, an acceleration sensor, amagnetic sensor, a gyro sensor, an inertial sensor, an RGB sensor, an IRsensor, a fingerprint recognition sensor, an ultrasonic sensor, a lightsensor, a microphone and/or a radar. The power supply unit 140 c maysupply power to the XR device 100 a and include a wired/wirelesscharging circuit, a battery, etc.

For example, the memory unit 130 of the XR device 100 a may includeinformation (e.g., data) needed to generate the XR object (e.g., anAR/VR/MR object). The I/O unit 140 a may receive a command formanipulating the XR device 100 a from a user and the control unit 120may drive the XR device 100 a according to a driving command of a user.For example, when a user desires to watch a film or news through the XRdevice 100 a, the control unit 120 transmits content request informationto another device (e.g., a hand-held device 100 b) or a media serverthrough the communication unit 130. The communication unit 130 maydownload/stream content such as films or news from another device (e.g.,the hand-held device 100 b) or the media server to the memory unit 130.The control unit 120 may control and/or perform procedures such asvideo/image acquisition, (video/image) encoding, and metadatageneration/processing with respect to the content and generate/outputthe XR object based on information about a surrounding space or a realobject obtained through the I/O unit 140 a/sensor unit 140 b.

The XR device 100 a may be wirelessly connected to the hand-held device100 b through the communication unit 110 and the operation of the XRdevice 100 a may be controlled by the hand-held device 100 b. Forexample, the hand-held device 100 b may operate as a controller of theXR device 100 a. To this end, the XR device 100 a may obtain informationabout a 3D position of the hand-held device 100 b and generate andoutput an XR object corresponding to the hand-held device 100 b.

Examples of Robot to which the Present Disclosure is Applied

FIG. 37 illustrates a robot applied to the present disclosure. The robotmay be categorized into an industrial robot, a medical robot, ahousehold robot, a military robot, etc., according to a used purpose orfield.

Referring to FIG. 50, a robot 100 may include a communication unit 110,a control unit 120, a memory unit 130, an I/O unit 140 a, a sensor unit140 b, and a driving unit 140 c.

The communication unit 110 may transmit and receive signals (e.g.,driving information and control signals) to and from external devicessuch as other wireless devices, other robots, or control servers. Thecontrol unit 120 may perform various operations by controllingconstituent elements of the robot 100. The memory unit 130 may storedata/parameters/programs/code/commands for supporting various functionsof the robot 100. The I/O unit 140 a may obtain information from theexterior of the robot 100 and output information to the exterior of therobot 100. The I/O unit 140 a may include a camera, a microphone, a userinput unit, a display unit, a speaker, and/or a haptic module. Thesensor unit 140 b may obtain internal information of the robot 100,surrounding environment information, user information, etc. The sensorunit 140 b may include a proximity sensor, an illumination sensor, anacceleration sensor, a magnetic sensor, a gyro sensor, an inertialsensor, an IR sensor, a fingerprint recognition sensor, an ultrasonicsensor, a light sensor, a microphone, a radar, etc. The driving unit 140c may perform various physical operations such as movement of robotjoints. In addition, the driving unit 140 c may cause the robot 100 totravel on the road or to fly. The driving unit 140 c may include anactuator, a motor, a wheel, a brake, a propeller, etc.

Examples of AI Device to which the Present Disclosure is Applied

FIG. 38 illustrates an AI device applied to the present disclosure. TheAI device may be implemented by a fixed device or a mobile device, suchas a TV, a projector, a smartphone, a PC, a notebook, a digitalbroadcast terminal, a tablet PC, a wearable device, a Set Top Box (STB),a radio, a washing machine, a refrigerator, a digital signage, a robot,a vehicle, etc.

Referring to FIG. 38, an AI device 100 may include a communication unit110, a control unit 120, a memory unit 130, an I/O unit 140 a/140 b, alearning processor unit 140 c, and a sensor unit 140 d.

The communication unit 110 may transmit and receive wired/radio signals(e.g., sensor information, user input, learning models, or controlsignals) to and from external devices such as other AI devices (e.g.,100 x, 200, or 400 of FIG. 32) or an AI server (e.g., 400 of FIG. 32)using wired/wireless communication technology. To this end, thecommunication unit 110 may transmit information within the memory unit130 to an external device and transmit a signal received from theexternal device to the memory unit 130.

The control unit 120 may determine at least one feasible operation ofthe AI device 100, based on information which is determined or generatedusing a data analysis algorithm or a machine learning algorithm. Thecontrol unit 120 may perform an operation determined by controllingconstituent elements of the AI device 100. For example, the control unit120 may request, search, receive, or use data of the learning processorunit 140 c or the memory unit 130 and control the constituent elementsof the AI device 100 to perform a predicted operation or an operationdetermined to be preferred among at least one feasible operation. Thecontrol unit 120 may collect history information including the operationcontents of the AI device 100 and operation feedback by a user and storethe collected information in the memory unit 130 or the learningprocessor unit 140 c or transmit the collected information to anexternal device such as an AI server (400 of FIG. 32). The collectedhistory information may be used to update a learning model.

The memory unit 130 may store data for supporting various functions ofthe AI device 100. For example, the memory unit 130 may store dataobtained from the input unit 140 a, data obtained from the communicationunit 110, output data of the learning processor unit 140 c, and dataobtained from the sensor unit 140. The memory unit 130 may store controlinformation and/or software code needed to operate/drive the controlunit 120.

The input unit 140 a may acquire various types of data from the exteriorof the AI device 100. For example, the input unit 140 a may acquirelearning data for model learning, and input data to which the learningmodel is to be applied. The input unit 140 a may include a camera, amicrophone, and/or a user input unit. The output unit 140 b may generateoutput related to a visual, auditory, or tactile sense. The output unit140 b may include a display unit, a speaker, and/or a haptic module. Thesensing unit 140 may obtain at least one of internal information of theAI device 100, surrounding environment information of the AI device 100,and user information, using various sensors. The sensor unit 140 mayinclude a proximity sensor, an illumination sensor, an accelerationsensor, a magnetic sensor, a gyro sensor, an inertial sensor, an RGBsensor, an IR sensor, a fingerprint recognition sensor, an ultrasonicsensor, a light sensor, a microphone, and/or a radar.

The learning processor unit 140 c may learn a model consisting ofartificial neural networks, using learning data. The learning processorunit 140 c may perform AI processing together with the learningprocessor unit of the AI server (400 of FIG. 32). The learning processorunit 140 c may process information received from an external devicethrough the communication unit 110 and/or information stored in thememory unit 130. In addition, an output value of the learning processorunit 140 c may be transmitted to the external device through thecommunication unit 110 and may be stored in the memory unit 130.

INDUSTRIAL APPLICABILITY

The above-described embodiments of the present disclosure are applicableto various mobile communication systems.

1. A method of a user equipment (UE) in a wireless communication system,the method comprising: receiving a plurality of discovery signals in oneof a plurality of bandwidth parts (BWPs); transmitting allocationinformation about remaining BWPs except for the one BWP among theplurality of BWPs in the one BWP, based on delay spread values of theplurality of respective discovery signals; and receiving a plurality ofsidelink control signals and data signals in the remaining BWPs, whereinthe one BWP is configured to be used only with an extended cyclic prefix(CP), and the remaining BWPs are configured to be used only with anormal CP.
 2. The method according to claim 1, wherein based on thedelay spread values being included in a length of the normal CP, theremaining BWPs are allocated differently to a plurality of respectiveUEs which have transmitted the plurality of discovery signals.
 3. Themethod according to claim 2, wherein based on the delay spread valuesbeing equal to or larger than (n−1) times the length of the normal CPand less than n times the length of the normal CP, the remaining BWPsare allocated differently to the plurality of respective UEs which havetransmitted the plurality of discovery signals, and n is a naturalnumber.
 4. The method according to claim 2, wherein the one BWP and theremaining BWPs are allocated to different resources in a time domain. 5.The method according to claim 4, wherein a time gap is configuredbetween the one BWP and the remaining BWPs.
 6. The method according toclaim 2, wherein the allocation information includes an index of a BWPallocated to each of a plurality of UEs which have transmitted theplurality of discovery signals.
 7. An apparatus for a user equipment(UE) in a wireless communication system, the apparatus comprising: atleast one processor; and at least one memory operably coupled to the atleast one processor and storing at least one instruction which causesthe at least one processor to perform operations, wherein the operationsinclude: receiving a plurality of discovery signals in one of aplurality of bandwidth parts (BWPs); transmitting allocation informationabout remaining BWPs except for the one BWP among the plurality of BWPsin the one BWP, based on delay spread values of the plurality ofrespective discovery signals; and receiving a plurality of sidelinkcontrol signals and data signals in the remaining BWPs, and wherein theone BWP is configured to be used only with an extended cyclic prefix(CP), and the remaining BWPs are configured to be used only with anormal CP.
 8. The apparatus according to claim 7, wherein based on thedelay spread values being included in a length of the normal CP, theremaining BWPs are allocated differently to a plurality of respectiveUEs which have transmitted the plurality of discovery signals.
 9. Theapparatus according to claim 8, wherein based on the delay spread valuesbeing equal to or larger than (n−1) times the length of the normal CPand less than n times the length of the normal CP, the remaining BWPsare allocated differently to the plurality of respective UEs which havetransmitted the plurality of discovery signals, and n is a naturalnumber.
 10. The apparatus according to claim 8, wherein the one BWP andthe remaining BWPs are allocated to different resources in a timedomain.
 11. The apparatus according to claim 8, wherein the allocationinformation includes an index of a BWP allocated to each of a pluralityof UEs which have transmitted the plurality of discovery signals. 12.The apparatus according to claim 7, wherein the UE is an autonomousdriving vehicle or is included in an autonomous driving vehicle.
 13. Aprocessor for performing operations for a user equipment (UE) in awireless communication system, wherein the operations include: receivinga plurality of discovery signals in one of a plurality of bandwidthparts (BWPs); transmitting allocation information about remaining BWPsexcept for the one BWP among the plurality of BWPs in the one BWP, basedon delay spread values of the plurality of respective discovery signals;and receiving a plurality of sidelink control signals and data signalsin the remaining BWPs, and wherein the one BWP is configured to be usedonly with an extended cyclic prefix (CP), and the remaining BWPs areconfigured to be used only with a normal CP.
 14. A computer-readablestorage medium storing at least one computer program including at leastone instruction which, when executed by at least one processor, causesthe at least one processor to perform operations for a user equipment(UE), wherein the operations include: receiving a plurality of discoverysignals in one of a plurality of bandwidth parts (BWPs); transmittingallocation information about remaining BWPs except for the one BWP amongthe plurality of BWPs in the one BWP, based on delay spread values ofthe plurality of respective discovery signals; and receiving a pluralityof sidelink control signals and data signals in the remaining BWPs, andwherein the one BWP is configured to be used only with an extendedcyclic prefix (CP), and the remaining BWPs are configured to be usedonly with a normal CP.
 15. The method according to claim 4, wherein atime gap is configured between the remaining BWPs adjacent to eachother.